21006804970 has 32 divisors (see below), whose sum is σ = 41328009216. Its totient is φ = 7653331200.

The previous prime is 21006804899. The next prime is 21006805031. The reversal of 21006804970 is 7940860012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1987786 + ... + 1998325.

It is an arithmetic number, because the mean of its divisors is an integer number (1291500288).

Almost surely, 2^21006804970 is an apocalyptic number.

21006804970 is a deficient number, since it is larger than the sum of its proper divisors (20321204246).

21006804970 is a wasteful number, since it uses less digits than its factorization.

21006804970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3986166.

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 21006804970 in words is "twenty-one billion, six million, eight hundred four thousand, nine hundred seventy".